In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op.
Unlocked: 29 Sep 2011 20:44:59
Audiophile
75Find all Audio Logs, alone or with another ODST.
Unlocked: 08 Sep 2011 00:48:01
Killing things that are new and different is bad, alone or with another ODST.
Unlocked: 05 Sep 2011 23:57:52
Super Sleuth
10Find the final clue unraveling the mystery, alone or with another ODST.
Unlocked: 05 Sep 2011 23:39:23
Killing things that are new and different is good, alone or with another ODST.
Unlocked: 06 Feb 2010 22:56:20
Score over 200,000 points in Firefight on Chasm Ten.
Unlocked: 12 Oct 2009 16:58:07
Score over 200,000 points in Firefight on Last Exit.
Unlocked: 12 Oct 2009 01:40:37
Score over 200,000 points in Firefight on Windward.
Unlocked: 08 Oct 2009 21:23:47
Score over 200,000 points in Firefight on Alpha Site.
Unlocked: 05 Oct 2009 23:40:10
Score over 200,000 points in Firefight on Security Zone.
Unlocked: 30 Sep 2009 21:47:17
Score over 200,000 points in Firefight on Rally Point.
Unlocked: 29 Sep 2009 21:46:45
Score over 200,000 points in Firefight on Lost Platoon.
Unlocked: 28 Sep 2009 23:05:53
Score over 200,000 points in Firefight on Crater.
Unlocked: 28 Sep 2009 01:25:08
All Ears
30Find 15 Audio Logs, alone or with another ODST.
Unlocked: 26 Sep 2009 01:50:18
In Firefight, finish a full round without killing a single enemy.
Unlocked: 25 Sep 2009 02:34:59
Data Hive
50Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 25 Sep 2009 02:25:23
Complete the Campaign on Normal difficulty.
Unlocked: 25 Sep 2009 02:25:23
Complete the Campaign on Heroic difficulty.
Unlocked: 25 Sep 2009 02:25:23
Complete the Campaign on Legendary to unlock a new Firefight character.
Unlocked: 25 Sep 2009 02:25:23
Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
Unlocked: 25 Sep 2009 01:42:24
Tayari Plaza
30Complete Tayari Plaza on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 24 Sep 2009 21:44:09
Complete Uplift Reserve on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 24 Sep 2009 21:28:27
Plasma Pistol Overcharge and quickly kill 10 Brutes.
Unlocked: 24 Sep 2009 13:59:40
Get 10 Needler supercombine kills on any covenant.
Unlocked: 24 Sep 2009 13:25:46
Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 24 Sep 2009 01:32:20
Complete Highway on 4-player Legendary LIVE co-op, with Iron, and no 'Hog or Scorpion.
Unlocked: 24 Sep 2009 01:32:20
Kill 10 enemies with the Flamethrower on Data Hive.
Unlocked: 23 Sep 2009 23:38:11
Complete Kikowani Station on Normal, Heroic, or Legendary.
Unlocked: 23 Sep 2009 23:11:12
NMPD HQ
30Complete NMPD HQ on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 23 Sep 2009 22:35:02
Get 15 headshot kills on NMPD HQ.
Unlocked: 23 Sep 2009 22:34:10
Complete ONI Alpha Site on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Unlocked: 23 Sep 2009 22:19:20
Get 10 Spartan Laser kills on ONI Alpha Site.
Unlocked: 23 Sep 2009 22:05:02
Tuned In
15Find 3 Audio Logs, alone or with another ODST.
Unlocked: 23 Sep 2009 22:01:11
Headcase
5Finish any level with at least one Skull activated.
Unlocked: 23 Sep 2009 21:58:11
Complete Kizingo Blvd. on Normal, Heroic, or Legendary to unlock a new Firefight character.
Unlocked: 23 Sep 2009 21:58:11
Get 10 Rocket kills on Kizingo Boulevard.
Unlocked: 23 Sep 2009 21:26:28
Gumshoe
10Find the 3rd clue unraveling the mystery, alone or with another ODST.
Unlocked: 23 Sep 2009 19:33:30
Kill all Wraiths in Uplift Reserve.
Unlocked: 22 Sep 2009 21:25:29
Stun a vehicle with an overcharged plasma pistol and quickly kill the driver.
Unlocked: 22 Sep 2009 21:10:54
Get 5 sticky grenade kills in any level.
Unlocked: 22 Sep 2009 21:03:02
Listener
5Find the first Audio Log.
Unlocked: 22 Sep 2009 20:55:32
Trade weapons with a fellow character.
Unlocked: 22 Sep 2009 20:39:58
Find the first clue unraveling the mystery.
Unlocked: 22 Sep 2009 20:34:19
Get 10 automag headshot kills in any level.
Unlocked: 22 Sep 2009 20:30:54
Tourist
5Access and download the city map to your VISR.
Unlocked: 22 Sep 2009 20:28:06
Kill 5 enemies while using VISR mode.
Unlocked: 22 Sep 2009 20:26:54
Heal Up
5Find the first Medical Kiosk and heal yourself.
Unlocked: 22 Sep 2009 20:25:08